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Corrosion resistant thermowells with thin wall tips

a thermowell and corrosion resistance technology, applied in the field of thermowells, can solve problems such as plant shutdown and failure of thermowells

Active Publication Date: 2015-11-19
MICROMOLD PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a thermowell that is highly resistant to corrosion. This is achieved by enclosing the basic metal well with a jacket made from a material that can withstand corrosion, such as polytetrafluoroethylene (PTFE). The conductive well can also be improved by installing a thin layer of conductive paste at the base of the well to enhance response time.

Problems solved by technology

There have been many instances of thermowell failures, many of which have been attributed to such vibrations induced by fluid flows.
One such well-publicized event occurred in 1995, when the failure of a thermowell from vibration at the Monju nuclear power plant in Japan caused leakage of molten sodium coolant resulting in the shutdown of the plant.

Method used

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  • Corrosion resistant thermowells with thin wall tips
  • Corrosion resistant thermowells with thin wall tips
  • Corrosion resistant thermowells with thin wall tips

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Embodiment Construction

[0055]Referring to the drawings in detail, FIGS. 1A-B show the thermowells 20 in accordance with an exemplary embodiment of the claimed invention. Thermowells are commonly used in process containment devices such as process vessels or pipes to protect sensitive temperature measuring devices such as thermocouples, RTDs, or thermometers from damage due to rapid fluid flows and / or aggressively corrosive environments. The claimed thermowell provides extreme corrosion resistance at temperatures up to the allowable temperatures for the polytetrafluorethylene (PTFE) material, i.e., 260° C. (500° F.).

[0056]As shown in FIGS. 1A-1B, the claimed thermowell 20 has a shell comprising a metal flange 21, a metal tube 22 and a conductive well 23, that can be made from readily available metals. The shell provides the basic structure and strength of the thermowells 20. The particular design features of the claimed thermowells 20 allow for the use of an unusually wide range of lengths and diameters. L...

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Abstract

A corrosion resistant thermowells with thin wall tips for use in unusually difficult industrial applications such as pharmaceutical and chemical process plants and semiconductor manufacturing facilities. These facilities have process environments that may include at least one of the following: highly corrosive fluids, difficult mechanical conditions such as rapid or turbulent fluid flows, and / or reasonably high process temperatures and / or pressures. The corrosion resistant thermowells provide isolation between a temperature sensor and a fluid to be measured.

Description

RELATED APPLICATION[0001]This application is a continuation-in-part of application Ser. No. 13 / 652,315 filed Oct. 15, 2012, which claims the benefit of U.S. Provisional Application No. 61 / 546,796 filed Oct. 13, 2011, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The claimed invention relates to PTFE (polytetrafluorethylene) jacketed tantalum tipped and also PTFE tipped thermowells, more particularly to thermowells for use in unusually difficult industrial applications.BACKGROUND OF THE INVENTION[0003]Thermowells are commonly used in industry to protect sensitive temperature measurement instruments such as thermocouples, RTDs (Resistance Temperature Detectors), or thermometers from conditions of process fluids that may cause the bare instrument to suffer damage. The claimed invention relates to a new configuration for the construction of such thermowells for use in unusually difficult industrial applications such as pharmaceutical and chemical ...

Claims

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Application Information

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IPC IPC(8): G01K1/16G01K1/08
CPCG01K1/08G01K1/16G01K1/10
Inventor LUKACH, JR., ARTHUR S.
Owner MICROMOLD PRODS
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